I own a made in Germany P226 and a CZ Shadow. The CZ was my first handgun, the one I shoot the best and is still stock. The Sig P226 is a good gun, no question about it but I am not as accurate with it. Modifications or features I recommend for the P226 are a short reset trigger, a lighter hammer spring and the E2 grips. But to be honest, after all those modifications, I am still more accurate with the CZ.
Sig P226 after mods VS CZ Shadow:
Trigger pull = CZ
Trigger reset = Sig
Sights = CZ
Grip = CZ
Mag release = both
Slide removal = Sig
Fit and finish = Sig
Sig annoyances = I have to change my grip on the gun or my right thumb prevents the slide from locking back because of the location of the slide lever.
CZ annoyances = The slide lever is too far forward and out of reach.
If you need mags for a Sig, I recommend Mec-Gar over the Sig brand.
Hope this helps and good luck.